/* * Copyright (c) 2010, Loughborough University - Computer Science * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This file is part of the Contiki operating system. */ /** * \file * Hardware-dependent functions for the cc253x watchdog. * * This file contains an ISR and must reside in the HOME bank. * * \author * George Oikonomou - <oikonomou@users.sourceforge.net> */ #include "cc253x.h" #include "sfr-bits.h" #include "contiki-conf.h" #define WDT_TIMEOUT_MIN (WDCTL_INT1 | WDCTL_INT0) /*---------------------------------------------------------------------------*/ void watchdog_init(void) { WDCTL = 0; /* IDLE, Max Interval */ } /*---------------------------------------------------------------------------*/ void watchdog_start(void) { WDCTL |= WDCTL_MODE1; /* Start in Watchdog mode */ } /*---------------------------------------------------------------------------*/ void watchdog_periodic(void) { /* Write the 'clear' sequence while maintaining mode and interval setting */ WDCTL = (WDCTL & 0x0F) | WDCTL_CLR3 | WDCTL_CLR1; WDCTL = (WDCTL & 0x0F) | WDCTL_CLR2 | WDCTL_CLR0; } /*---------------------------------------------------------------------------*/ void watchdog_reboot(void) { WDCTL = WDT_TIMEOUT_MIN; /* Dis-acknowledge all interrupts while we wait for the dog to bark */ DISABLE_INTERRUPTS(); WDCTL |= WDCTL_MODE1; /* Just in case it's not started... */ /* NOP till the dog barks... */ while(1) { ASM(nop); } }